Pressure-compensated flowmeters provide which of the following?
a. Inaccurate estimates of flow c. Back pressure
b. Accurate estimates of flow d. A means to estimate leaks
ANS: B
On pressure-compensated flowmeters, the needle valve controlling gas flow out of the flowmeter is located distal to the Thorpe tube. This arrangement allows the pressure in the indicator tube to be maintained at the source gas pressure, which ensures an accurate estimate of flow.
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